Blowgun



Feb. 13, 1945. I N, KQEHN 2,369,356

BLow GUN Filed Jan. 29, 1941 'f z 49 7 57 je Wfl/"Www 49 f y 45 a4 54 :LT-'IIE 4.5-

a ATTORNEY Patentedreb. 13, 1945 t 2,369,356 a f il; Berkelemiclif;

` The invention'v Arelates` yto 'air tools fftle type i including;inf'co-mb-ination;ianiairJ-nozzle and a" manually' operatedl valve associated there-with for controlling f the flowf of; l airithrough--the nozzle and used generally in shops` aridllaboratoriesand the like Ifor blowingoliL dust orfmetalparticles from machinery; andf parts -and' the" like, `for air blasting, cleaning, fetc. v t

1 An objectief thelnventionisto provide a-blow I u iigun'oi the'zcharacterdescribed wherein-the valve I mechanismthereof"will have adesirable'short #"2 Lland llveryi sensitive` range of movement incom- `Lbinationwwith a manually-*operated leverfwhich is` so connected to the valvel'mechanismrso as to 'v greatly 1- extendthe 'operating' -rang-fthe'reof andV s0 reducethe required motivating forceasf to Iprovide a device having a very easy andfabc'urate manual` operation, t I I I Another objectieflmewmvenuoni-is'to provide' f a blow 'gun oflthe character; 'describecllwherein` I i the exterior; exposed mjioving f parts'- ofi-th *device 1 are `.relatively large fr and fwellwspacedse-Ii as4 to c: v permit. easy and readyucleaning olftheidevicewand I to'avo-idthe'lodging ofausuicientdirtgfoilflo other `-vice tointerfere` gun. n t t I I t v t v v v I Thez inventionaf:possessesl-otherf-Iobjectsi:land

thewoperation of :the blow n.l'sfeatures of 'advantagegi some of "whichgawithithe I v w foregoing, `will `be setl forthrE in theffollowingl-:dee I scription orf the'preferredfformoffthesinvention I which isi illustrated-'1in :1 the -zzdrawingff accompany- -sing andformingpartxof thegspecicationrIt is I `to be understood;however;thatrvariationslin=the t I showing -I made by thesaidvdrawingrand: descrip- @tion maybeadoptedwithinfthefscope'lof thefin-I vention as set forthiin'theclaimsewReferring to said drawing: v I t r 1 Figure `Lisle/siderelevation lof a blow gun constructed in accordance with `the present in vention. i 1 v i Figure 2 is a plan view ofthe blow gun illustrated in Figure 1.

Figure 3 is an enlarged view of a part of the blow gun illu Figures 1 and 2.

Figure 4 is a cross-sectional view of the blow gun taken substantially on the plane of line 1 -4.v

longitudinal sectional strated in Olf Figure 1, the scale of Figure 4 being somewhat larger than lthat of Figure 1. v

Figure 5 is a fragmentary longitudinal sec` tional view of enlarged size showing a portion of the blow gun. A

The blow gun illustrated in the'accompanving drawingconsists of a mainbody I which is com- 65 "M-posed `of ajpairldfflelongated tubular threadably Vattat'xhed sections 8ai1d 9; th'eattachmentbeing here effected Lby'fthreading onefend portion II of h i ""Sectio'ri"Y /8l i i-lfitcl'` an intriorly threaded end ecessorisocketI-I. in-th`e1-secton 9`..` Thesen- 1 tionssarf provided" withv 'longitudinal passages 132e)V ylcn'igitudina'laligmnentfand;registration upon #attachment ofl-tlie fsections as described. Afseal m" 'ngi-'gasket I6 s-lclainpedjbetweeni `theinserted 'ndface IFP or th section '8\ and? the base I9 of the fecessll2; lPreferably; and as here-shown, asket 16-y `i`sfforme`dl withlialf central opening 2I v transversely into'a'nd "D zo. 4 i -urged'i to I arfse'ated position against;j the `gasket `6 lbymeans of a Thelical spring `-20 imounted in he-passag'e'l 3 and` compressedfbetween. the valve er? so `Yiaston tightly fit] lthroughfthe: opening `2 I nlthegasket I6` to'seal oithis end of the tubular reI-nber"Farini to engage and `displace tnefvalve 22 as away'fromfits' seat o'n-Lthelgasket;wtherebyfpiace the Vtubularmerr'rberZll inlregistration with I the l-ipassagellf As'wwillbelseen fromFigure S51-the A alvememberi22 decomposed of concentric inner Wand outerannlarf-walls l2 92 and 3 l which* arevc'on- 40 neeted at their ends away from the gasket by an end wall 32 which serves as a seat or rest for one I end of the springZ. In the seated position of the valve member 22, the opposite end of the outer annular Wall 3I engages the gasket II` while the adjacent end of the inner annular wall I 29 is positioned in aligned position with `respect to the inner end28 of the tubular member 24; Upon longitudinal `displacement of the tubular member, to the left as viewed in Figure 3, the

nular wall 29"and displaces the valve member to the left, thereby unseating the wall 3i from the t gasket)` In this unseated vposition of the valve,

" @therethrough-whichTare-positioned in .Alvalve member22 ismounted"forlongitudinal ecip'rocationimthepassag= I3 `and is normally I `fand ai internal .l shoulder 23 Kin the passage. Mounted-` for longitudinal freciprocation in fthe p'a'ssageldiis'atubularmember 24,5wliichiishere n I end`28"engages the adjacent end of the inner an' -plurality of openings 33 provided in the annu-v tions y26 and 21 of the tubular member 24 are of such construction and length that the telescopic attachment of these sections is arranged at the opening 36, and in accordance with the present construction, an abutment member 31 is mounted on a reduced end portion 38 of the section 21 which is telescopically received into the-adjacent end portion 39 of the section 26, whereby the abutment member 31 is clamped between the end of v the portion 39 and a shoulder 4 I at the end of the reduced portion 38.

Preferably the intertting portions 36 and 39 are of pressed t whereby the abutment member 31 is permanently anchored in place in the opening 36 adjacent to one end wall 42 of the opening. The lever 34 is provided with an end portion 43 which is positioned in the opening 36 and provided with an opening 44 r loosely surrounding the tubular member between an opposite end wall 46 of the opening 36 and the adjacent oppose-d end surface 41 of the abutment. Thefree end 48 of the lever is positioned below the tubular member and may be moved to engage the end wall 46 of the opening as illus- K trated in Figure 3, so as to serve as a point of support for the lever when rocked against the face 41 of the abutment to longitudinally displace the tubular member 24. Preferably the end face 41 of the' abutment is curved to facilitate movement of the lever thereagainst. As here shown the end face 41 of the abutment 31 is formed with a bear- `ing recess 53 which is adapted to receive a -rounde-d projection 54 formed on the end portion 43 of the operating lever 34. This form of bearing engagement between the lever and abutment,

as will be evident, will cause the lever to pivot rather than slide on the abutment, and thus provide a very smooth and practically effortless abutment displacing action. The outer end portion 49 of the lever is preferably bent at an angle from the end portion 43 extended into the opening so as to overlie the body portion of the device for convenient engagement by the iingers of the operator in the normal grasping of the device.

As will be seen from lthe foregoing, the relatively strong action of spring 20 aided by the air pressure in passage I3 provides a rrn positive seating of the valv'e 3l on the gasket, and by reason of the direct end abutment of the valve with the gasket, only a relatively small movement of the valve away from the gasket is necessary in order to provide substantially full output of air. In this manner a desirable positiveness and short range and sensitivity of operation is obtained. While this strong positive operation of the valve mechanism is desirable from a mechanical standpoint, a longer range of movement and a substantially reduced force of motivationis desirable from an operational standpoint. The lever construction here used provides a substantial mechanical advantage wherein relatively large easy movement of the outer end of the lever is translated into a short powerful movement of the valve. In this manner the range of the valve movement is considerably exten-ded and easy and accurate of operation ofthe device results over the full operating range of the air gun.

As another important feature of the present construction, the opening 36 is of sufficient size relative to the size of the abutment 31 and the lever end portion 43 to provide a substantial spacing between the abutment and the lever from the adjacent walls of the `opening, thereby rendering the device easy to clean and avoiding the lodging of sufcient oil or dirt or other foreign matter to interfere with the normal operation of the device. As willbe seen from Figure 3, a substantial spacing is provided between the abutment 31 and the end wall 42 of the opening and between the opposite side of the abutment and the opposite end wall 46 of the opening. Also the lever may be moved by reason of its loose connection to the tubular member, into aposition where the same is completely spaced from the abutment member 41 to thereby enable ready cleaning between these members.

I claim:

In a blow gun of the character described, a body having axially spaced bearing portions with aligned bores, an air tube slidable axially in and extending through said bores and being exposed eXteriorly in the space between said bearings, a'n

lever against the adjacent bearing and to engage said projection in said recess to longitudinally displace said tu-bular member.

NATHANIEL KOEHN. 

